Crossword Genius

Join a religious man (3)

Ross

I believe the answer is:

add

'join' is the definition.
(thesaurus)

'a religious man' is the wordplay.
'religious man' becomes 'DD' (abbreviation for Doctor of Divinity degree).
'a'+'dd'='ADD'

(Other definitions for add that I've seen before include "Combine (numbers)" , "Sum, put together" , "Tot; append" , "Aggregate or supplement" , "Reckon" .)

I've seen this clue in The Mirror.
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