Crossword Genius

Fun to carry on with golf in old age (9)

Ross

I believe the answer is:

longevity

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

'old age' is the definition.
(thesaurus)

'fun to carry on with golf' is the wordplay.
'fun' becomes 'levity' (I am not sure about this - if you are sure you should believe this answer much more).
'to carry' is an insertion indicator.
'with' is a charade indicator (letters next to each other).
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
'on'+'g'='ong'
'levity' placed around 'ong' is 'LONGEVITY'.

'in' is the link.

Can you help me to learn more?

(Other definitions for longevity that I've seen before include "sustained survival?" , "Lengthy life" , ""Length of days"" , "far from short life" , "endurance" .)

I've seen this clue in The Telegraph.
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