Let's look first for some openings (7)
I believe the answer is:
eyelets
'some openings' is the definition.
(eyelet is a kind of opening)
'let's look first' is the wordplay.
'look' becomes 'eye' (eyeing is a kind of looking).
'first' means one lot of letters go next to another.
'lets' after 'eye' is 'EYELETS'.
'for' acts as a link.
(Other definitions for eyelets that I've seen before include "Small holes" , "peep-holes" , "Rings for reinforcement" .)