They take back what they say about farm vehicles (10)

I believe the answer is:

retractors

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'they take back' is the definition.
(I've seen this before)

'about farm vehicles' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'farm vehicles' becomes 'tractors' (I've seen this in another clue).
're'+'tractors'='RETRACTORS'

'what they say' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for retractors that I've seen before include "surgical instruments" , "They take back" .)

I've seen this clue in The Irish Independent.

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