Light-hearted son having to bear constant struggles (7)

I believe the answer is:

jockeys

'struggles' is the definition.

'light-hearted son having to bear constant' is the wordplay.
'light-hearted' becomes 'jokey'.
'son' becomes 's'.
'having to bear' indicates putting letters inside.
'constant' becomes 'c' (mathematical abbreviation).
'jokey'+'s'='jokeys'
'jokeys' enclosing 'c' is 'JOCKEYS'.

(Another definition for jockeys that I've seen is " Riders in a race".)

I've seen this clue in The Times.

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