Rather old to be harnessing a horse? (7,2,1,3)
I believe the answer is:
getting on a bit
'rather old' is the definition.
(I've seen this before)
'be harnessing a horse?' is the wordplay.
I cannot really understand how this works, but
'be' could be 'go' (going is a kind of being) and 'go' is found within the answer.
'a' is found in the answer.
This explanation may well be incorrect...
'to' acts as a link.
Can you help me to learn more?
(Another definition for getting on a bit that I've seen is " Rather old".)
I've seen this clue in The Globe and Mail and The Guardian.
Want a hint initially instead of a full solution?
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