With last of goulash consumed, have too much stew (8)
I believe the answer is:
overheat
'too much stew' is the definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Maybe you can see a link between them that I can't see?
'with last of goulash consumed have' is the wordplay.
'with' indicates putting letters inside.
'last of' indicates one should take the final letters.
'consumed' becomes 'over' (I can't justify this - if you can you should give a lot more credence to this answer).
'have' becomes 'eat' (have can mean to eat or consume).
The last letter of 'goulash' is 'h'.
'over'+'eat'='overeat'
'h' put into 'overeat' is 'OVERHEAT'.
Can you help me to learn more?
(Other definitions for overheat that I've seen before include "Get very excited" , "Become too warm" , "burn" , "Get too hot" , "get sunstroke?" .)