Agreement between spelling group and social worker (8)
I believe the answer is:
covenant
'agreement' is the definition.
(covenant is a kind of agreement)
'group and social worker' is the wordplay.
'group' becomes 'coven' (coven is a kind of group**).
'and' says to put letters next to each other.
'social worker' becomes 'ant' (I've seen this before).
'coven'+'ant'='COVENANT'
'between spelling' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for covenant that I've seen before include "pledge" , "Concordat, compact" , "Formal binding agreement" , "Contract made in a convent" , "Formal agreement between two or more parties" .)