Fairly inflexible suits sent back by swimmer (8)
I believe the answer is:
stiffish
'fairly inflexible' is the definition.
I can't tell whether this defines the answer.
'suits sent back by swimmer' is the wordplay.
'suits' becomes 'fits' ('fit' can be a synonym of 'suit').
'sent back' is a reversal indicator.
'by' is a charade indicator (letters next to each other).
'swimmer' becomes 'fish' (fish swim).
'fits' backwards is 'stif'.
'stif'+'fish'='STIFFISH'
Can you help me to learn more?
(Another definition for stiffish that I've seen is " quite starchy".)