Lockers A to G perhaps (4)
I believe the answer is:
keys
I believe this clue is a double definition.
'lockers' is the first definition.
(I've seen this in another clue)
'a to g perhaps' is the second definition.
(I've seen this before)
(Other definitions for keys that I've seen before include "'Unlockers'" , "Lock openers" , "Bunch of openers?" , "A to G perhaps" , "House of ----, IoM legislature" .)