Crossword Genius

Separatists spout about forbidding pop music essentially (7,7)

Ross

I believe the answer is:

pilgrim fathers

I'm a little stuck... Click here to teach me more about this clue!

'separatists' is the definition.
Both the answer and definition are plural nouns.
Maybe they are linked in a way I don't understand?

'spout about forbidding pop music essentially' is the wordplay.
I cannot really understand how this works, but
'about' could be 'a' (abbreviation in Chambers) and 'a' is located in the answer.
'forbidding' could be 'grim' (I've seen this in another clue) and 'grim' is found in the answer.
'music' could be 'f' and 'f' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for pilgrim fathers that I've seen before include "left before dark in ship after storms" , "... emigrants to Massachusetts" , "settlers" .)

I've seen this clue in The Independent.
Want a hint initially instead of a full solution? Install my app