Crossword Genius

A second son for the prophet (4)

Ross

I believe the answer is:

amos

'the prophet' is the definition.
(I've seen this before)

'a second son' is the wordplay.
'second' becomes 'mo' (both are short periods of time).
'son' becomes 's'.
'a'+'mo'+'s'='AMOS'

'for' acts as a link.

(Other definitions for amos that I've seen before include "30th OT book" , "Prophet in the Bible" , "Hebrew prophet" , "Biblical character" , "man" .)

I've seen this clue in The Telegraph and The Guardian.
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