Caught bishop drinking spirit, small amount (5)
I believe the answer is:
crumb
'amount' is the definition.
(crumb is a kind of amount)
'caught bishop drinking spirit small' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'bishop' becomes 'B' (abbreviation for bishop in chess).
'drinking' means one lot of letters goes inside another (inserted letters are consumed or drunk).
'spirit small' becomes 'rum' (alcoholic spirit. I am not sure about the 'small' bit.).
'c'+'b'='cb'
'cb' going around 'rum' is 'CRUMB'.
Can you help me to learn more?
(Other definitions for crumb that I've seen before include "Very small quantity of something, especially food" , "Tiny piece of bread or cake" , "A shred of bread" , "Small morsel" , "offering a little comfort" .)