Produce information on deserter found in the middle of Leek (8)
I believe the answer is:
generate
'produce' is the definition.
(generating is a kind of producing)
'information on deserter found in the middle of leek' is the wordplay.
'information' becomes 'gen' (gen is a kind of information).
'on' means one lot of letters go next to another.
'deserter' becomes 'rat' (I've seen this before).
'found in' indicates putting letters inside.
'the middle of' indicates the central letters.
The central letters of 'leek' are 'ee'.
'rat' going inside 'ee' is 'erate'.
'gen'+'erate'='GENERATE'
(Other definitions for generate that I've seen before include "Give rise to" , "Produce - teenager (anag)" , "available in form" , "Cause to arise; produce" , "Create (power)" .)