A looker Hoskins picked up (3)
I believe the answer is:
eye
'a looker' is the definition.
(I've seen this in another clue)
'hoskins picked up' is the wordplay.
'hoskins' becomes 'I' (where the crossword setter is 'Hoskins').
'picked up' shows a homophone (sound like).
'i' sounds like 'EYE'.
(Other definitions for eye that I've seen before include "Needle or lace hole" , "central spot" , "round hole in sewer?" , "View" , "Twenty four ac emphasises it" .)