Physical activities of all sides today (6)
I believe the answer is:
sports
'physical activities' is the definition.
(I've seen this before)
'all sides today' is the wordplay.
I cannot really see how this works, but
'sides' could be 'ports' (port is a kind of side) and 'ports' is found in the answer.
A single letter 's' remains which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'of' is the link.
Can you help me to learn more?
(Other definitions for sports that I've seen before include "Wears; mutated creatures" , "Soccer and rugby, say" , "Eg, football, cricket" , "Wears (a noticeable item)" , "Wears, displays" .)