Put a question like 'the capital of Kenya?' (3)
I believe the answer is:
ask
'put a question' is the definition.
(I've seen this before)
'like the capital of kenya?' is the wordplay.
'like' becomes 'as'.
'the capital of' suggests taking the first letters.
The initial letter of 'kenya' is 'k'.
'as'+'k'='ASK'
(Other definitions for ask that I've seen before include "Inquire" , "Pose" , "Make enquiry" , "Enquire" , "Request, invite" .)