Abundant supply reduced and … what did you say? (3,3,4,5)
I believe the answer is:
cut and come again
'abundant supply' is the definition.
(I've seen this before)
'reduced and what did you say?' is the wordplay.
'reduced' becomes 'cut' (similar in meaning).
'what did you say?' becomes 'come again' (I've seen this before).
'cut'+'and'+'comeagain'='CUT-AND-COME-AGAIN'
(Other definitions for cut and come again that I've seen before include "Abundant supply" , "Plenty!" .)