Sport at Twickers English regret (3)
I believe the answer is:
rue
'regret' is the definition.
(synonyms)
'sport at twickers english' is the wordplay.
I cannot really understand how this works, but
'sport' could be 'ru' (rugby union) and 'ru' is found within the answer.
'english' could be 'e' (abbreviation) and 'e' is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for rue that I've seen before include "Wish not to have been" , "Regret or repent" , "Fish eggs" , "Deplore" , "Be regretful" .)