Huge container filled with spades (4)
I believe the answer is:
vast
'huge' is the definition.
(I've seen this before)
'container filled with spades' is the wordplay.
'container' becomes 'vat' (vat is a kind of container).
'filled with' is an insertion indicator.
'spades' becomes 's' (abbreviation in card games).
'vat' going around 's' is 'VAST'.
(Other definitions for vast that I've seen before include "Astronomical" , "Colossal" , "Extremely large or extensive" , "'Huge, immense (4)'" , "Boundless" .)