Correct groom once again (7)
I believe the answer is:
redress
'correct' is the definition.
(synonyms)
'groom once again' is the wordplay.
I cannot quite understand how this works, but
'groom' could be 'dress' (synonyms) and 'dress' is found in the answer.
'again' could be 're' (prefix meaning 'again') and 're' is present in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for redress that I've seen before include "Compensate" , "Get back into gear" , "Pay" , "Set right - compensation" , "Make amends for" .)