Crew finding sun on Welsh river (5)
I believe the answer is:
staff
'crew' is the definition.
(I've seen this before)
'sun on welsh river' is the wordplay.
'sun' becomes 's'.
'on' is a charade indicator (letters next to each other).
'welsh river' becomes 'taff' (I've seen this before).
's'+'taff'='STAFF'
'finding' is the link.
(Other definitions for staff that I've seen before include "Employees; sign of office" , "Post - office workers" , "Hands" , "Take a rod to the personnel?" , "Employees; sceptre" .)