Care for some lacklustre athletes (5)
I believe the answer is:
treat
'care for' is the definition.
(synonyms)
'some lacklustre athletes' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'TREAT' can be found hidden inside 'lacklustre athletes'.
(Other definitions for treat that I've seen before include "Enjoyable party" , "Practise medicine" , "Special delight; handle" , "Attend to; surprise gift" , "Act toward or regard in a certain way" .)