Lucky to have strength to catch fish (9)
I believe the answer is:
fortunate
'lucky' is the definition.
(similar in meaning)
'strength to catch fish' is the wordplay.
'strength' becomes 'forte' (synonyms).
'to catch' means one lot of letters goes inside another.
'fish' becomes 'tuna' (tuna is a type of fish).
'forte' placed around 'tuna' is 'FORTUNATE'.
'to have' is the link.
(Other definitions for fortunate that I've seen before include "Blessed with good luck" , "Lucky" .)