Crossword Genius

Progress made by the old man's son (4)

Ross

I believe the answer is:

pass

'progress' is the definition.
(passing is a kind of progressing)

'by the old man's son' is the wordplay.
'by' is a charade indicator (letters next to each other).
'the old man's' becomes 'pas' ('pa' can be a synonym of 'old man'**).
'son' becomes 's'.
'pas'+'s' is 'PASS'.

'made' is the link.

(Other definitions for pass that I've seen before include "Transfer" , "failure in quiz" , "Decline to answer" , "Ratify for saps" , "acceptable exam result" .)

I've seen this clue in The Telegraph.
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