Tender agreement imposing fine for Brexit (4)
I believe the answer is:
fond
'tender' is the definition.
(synonyms)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for fond that I've seen before include "Affectionate, maybe foolish" , "Keen on; indulgent" , "Partial to" , "Feeling affection, maybe foolish" , "Affectionate - tender" .)