Solution to 17D has been deliberately left unsolved and is to be answered by a non-regular/novice commenter, with proper annotation. Those who have answered earlier in the week, please give others a chance.
Open for anyone to answer, if not solved by 1 PM.
ACROSS
1 Want runs in the end (6) DEARTH {DEA{R}TH}
4 After headers of Cristiano Ronaldo, supporters start going crazy (8) CRACKERS {Cr...o}{Ro...o}{bACKERS}
9 Did without common parking for hotel (6) SPARED S(-h+p)PARED
10 Mumbai Indians celebrity, reportedly aggrieved, eventually moved (8) MIGRATED {MI}{(~great)GRATE}{a...eD}
13 Initially unacceptable terms also accommodated in complete reversal (10) SOMERSAULT {Un...e+TERMS+ALSO}*
15 Convey to American leader and escalate a crisis (5,2,1,4) BRING TO A HEAD {BRING}{TO}{A}{HEAD}
18 Instruction before young member of family takes foreign trip (12) PRESCRIPTION {PRE}{SCION} over {TRIP}*
21 Keeps returning to dock around Ukrainian port (10) SEVASTOPOL {SAVES}{TO}{LOP<=}
22 Nag about missing half of practice (4) CARP PRACtice<=
24 Associates with criminal types (8) CONSORTS {CON}{SORTS}
25 Eggs in bird cage, nearly hundred in the beginning (6) CAVIAR {AVIARy}<=>{C}
27 Insists on letting out front part of roadside property (6) ASSETS ASSErTS
DOWN
2 He's learned something that has no practical value (8) ACADEMIC [DD]
3 Openings for trained, reliable, electrical engineers in plant (4) TREE Acrostic
5 One way to get more space in the attic - make a lot of noise (5,3,4) RAISE THE ROOF [DD]
6 Cheats and complains about suffering hard times in the end (4,6) CARD SHARPS {CARPS} over {HARD+t..eS}*
7 Consumes drug and drink after a bit of temptation (4,2) EATS UP {E} and {SUP}<=>{A}{Te...n}
8 Dignified boy staying away from heated debates (6) SEDATE DEbATES*
11 Vehicle perhaps comes to outskirts of Raipur too (5,7) MOTOR SCOOTER {COMES+TO+Ra..uR+TOO}*
14 Rage so often produces violent people (10) AGGRESSORS {RAGE+SO}* [Letter Bank]
16 Agree on disposal of files implicating popular American (8) FINALISE {FILES}* over {IN}{A}
17 Produces fire and smoke basically (8) ?N?P?R?S ()
20 Balanced playing eleven - left out MSD finally (6) EVENED {ElEVEN}*{msD}
Reference List
Runs = R, Parking = P, Hotel = H, American = A, Hundred = C, American = US, Small = S, Drug = E, Boy = B, Left = L
