Lay awake, finally, in awful trauma (7)
I believe the answer is:
amateur
'lay' is the definition.
(as in a layman)
'awake finally in awful trauma' is the wordplay.
'finally' suggests the final letters.
'in' means one lot of letters goes inside another.
'awful' indicates anagramming the letters.
The final letter of 'awake' is 'e'.
'trauma' anagrammed gives 'amatur'.
'e' put into 'amatur' is 'AMATEUR'.
(Other definitions for amateur that I've seen before include "Tum area (anag.)" , "Inept, non-professional" , "Layperson" , "Unpaid practitioner" , "Athlete who performs without payment" .)