It’s painful for a gent struggling to tour the West Indies (6)
I believe the answer is:
twinge
'it's painful' is the definition.
I can't judge whether this definition defines the answer.
'a gent struggling to tour the west indies' is the wordplay.
'struggling' indicates anagramming the letters.
'to tour' is an insertion indicator (to tour can mean to go around).
'the west indies' becomes 'wi'.
'gent' is an anagram of 'tnge'.
'tnge' going around 'wi' is 'TWINGE'.
'for' is the link.
Can you help me to learn more?
(Other definitions for twinge that I've seen before include "Brief sudden pain" , "A slight pain or pang" , "Sudden darting pain" , "A small stab of pain" , "Momentary pain" .)