Duck called for ape (5)
I believe the answer is:
orang
'for ape' is the definition.
(orang is a kind of ape)
'duck called' is the wordplay.
'duck' becomes 'o' (resembles zero - 'duck' in cricket).
'called' becomes 'rang' (called on the phone).
'o'+'rang'='ORANG'
(Other definitions for orang that I've seen before include "Large ape" , "- - -utan" , "Wild animal briefly appeared" , "Primate" , "Short tree-dweller" .)