Have a break! Have a ginger biscuit! (4)
I believe the answer is:
snap
'a ginger biscuit' is the definition.
(I've seen this before)
'have a break' is the wordplay.
'have' becomes 'snp' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'break' indicates putting letters inside (inserted letters break the word apart).
'snp' placed around 'a' is 'SNAP'.
'have' acts as a link.
Can you help me to learn more?
(Other definitions for snap that I've seen before include "Break suddenly with cracking sound" , "Unpremeditated - bite" , "Bite at or utter angry words" , "Short spell" , "Be irritable at the card game" .)