Hold keys, entering every pantry, first of all (4)
I believe the answer is:
keep
'hold' is the definition.
(I know that hold can be written as keep)
'keys entering every pantry first of all' is the wordplay.
'first of all' suggests taking the first letters.
The first letters of 'keys entering every pantry' is 'KEEP'.
(Other definitions for keep that I've seen before include "Main tower of a medieval castle" , "Guard" , "Retain, maintain" , "Retain; part of castle" , "Retain; strong tower" .)