Call again, ringing yours truly, offering treatment (8)
I believe the answer is:
remedial
'call again ringing yours truly offering treatment' is the definition.
I can't judge whether this defines the answer.
'call again ringing yours truly' is the wordplay.
'call again' becomes 'redial' (I've seen this in another clue).
'ringing' means one lot of letters goes inside another.
'yours truly' becomes 'me' (the person who set this crossword).
'redial' enclosing 'me' is 'REMEDIAL'.
Can you help me to learn more?
(Other definitions for remedial that I've seen before include "Providing cure or help for disability" , "Concerned with those with learning difficulties, for example" , "palliative" , "Designed to be curative" , "special teaching" .)