Swimmer wasting time over process of getting better (5)
I believe the answer is:
rehab
'swimmer wasting time over process' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'getting better' is the wordplay.
I cannot quite see how this works, but
'getting' could be 're' (I've seen this in other clues) and 're' is found in the answer.
This may be the basis of clue (or it may be nonsense).
'of' acts as a link.
Can you help me to learn more?
(Other definitions for rehab that I've seen before include "Treatment for dependency" , "Process of restoring, eg, an addict to health" , "Treatment for, eg, addiction" , "Rehabilitation (abbrev.)" , "remedial treatment" .)