Attach and aim a listening device (6)
I believe the answer is:
endear
'attach' is the definition.
(thesaurus)
'aim a listening device' is the wordplay.
'aim' becomes 'end' (I've seen this before).
'a listening device' becomes 'ear' (I've seen this in other clues).
'end'+'ear'='ENDEAR'
'and' acts as a link.
(Other definitions for endear that I've seen before include "Delight - please" , "Neared (anag.)" , "Win over" , "Neared so as to make loved" , "ingratiate" .)