Had plenty from State Aid (8)
I believe the answer is:
satiated
'had plenty' is the definition.
'satiated' can be an answer for 'had' (satiating is a kind of having). I'm not sure about the 'plenty' bit.
'from state aid' is the wordplay.
'from' indicates anagramming the letters (from the letters).
'state'+'aid'='stateaid'
'stateaid' anagrammed gives 'SATIATED'.
Can you help me to learn more?
(Other definitions for satiated that I've seen before include "Too full, having eaten excessively" , "Fully replete" , "Glutted or cloyed with excess as of food" , "Fully satisfied" , "Filled to repletion" .)