Crossword Genius

Legendary hero and cave man (6)

Ross

I believe the answer is:

fingal

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

'legendary hero and cave' is the definition.
I know that 'cave' relates to this answer.

'man' is the wordplay.
I cannot quite see how this works, but
'man' could be 'gal' and 'gal' is located in the answer.
The remaining letters 'fin' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for fingal that I've seen before include "Caveman" , "His cave is on Staffa" , "Epic Scot" .)

I've seen this clue in the Evening Standard.
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