With difficulty, taking weight off eventually becomes relaxing (8)

I believe the answer is:

wresting

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'with difficulty taking weight off eventually' is the definition.
I can't tell whether this definition defines the answer.

'becomes relaxing' is the wordplay.
'becomes' becomes 'w' (I can't explain this - if you can you should believe this answer much more).
'relaxing' becomes 'resting' (I've seen this in another clue).
'w'+'resting'='WRESTING'

Can you help me to learn more?

(Other definitions for wresting that I've seen before include "Strewing (anag.)" , "Extracting" .)

I've seen this clue in The Irish Times.

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