Spread jam, skipping toast’s end on purpose (7)
I believe the answer is:
suffuse
'spread' is the definition.
(suffusing is a kind of spreading)
'jam skipping toast's end on purpose' is the wordplay.
I cannot quite understand how this works, but
'purpose' could be 'use' (synonyms) and 'use' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for suffuse that I've seen before include "Flood through" , "Of colour, spread slowly throughout" , "Spread; permeate" .)