Crossword Genius

Original ally crossing boundary (6)

Ross

I believe the answer is:

primal

'original' is the definition.
(synonyms)

'ally crossing boundary' is the wordplay.
'ally' becomes 'pal' (both can mean a friend or associate).
'crossing' indicates putting letters inside.
'boundary' becomes 'rim' (rim is a kind of boundary).
'pal' enclosing 'rim' is 'PRIMAL'.

(Other definitions for primal that I've seen before include "Original - basic" , "Sort of scream" , "Primeval, original" , "Having existed from the beginning" , "typifying some fear?" .)

I've seen this clue in The Sun.
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