Question disguise Mike dropped (3)
I believe the answer is:
ask
'question' is the definition.
(asking a question)
'disguise mike dropped' is the wordplay.
'disguise' becomes 'mask' (masking is a kind of disguising).
'mike' becomes 'M' (phonetic alphabet: alpha, bravo, charlie etc.).
'dropped' suggests deleting specific letters.
'mask' with 'm' taken out is 'ASK'.
(Other definitions for ask that I've seen before include "Pose" , "Make enquiry" , "Inquire" , "Enquire" , "Something demanded" .)