Wrens managed to eat the last bit of hazelnut spread (6)
I believe the answer is:
strewn
'spread' is the definition.
(thesaurus)
'wrens managed to eat the last bit of hazelnut' is the wordplay.
'managed' indicates anagramming the letters.
'to eat' means one lot of letters goes inside another.
'the last bit of' suggests the final letters.
The final letter of 'hazelnut' is 't'.
'wrens' with letters rearranged gives 'srewn'.
'srewn' going around 't' is 'STREWN'.
(Other definitions for strewn that I've seen before include "Spread untidily" , "Dispersed" , "Broadcast" , "Scatttered about untidily" , "Scattered over an area" .)