Henry I only comes to fish (7)
I believe the answer is:
halibut
'fish' is the definition.
(halibut is a kind of fish)
'henry i only' is the wordplay.
'henry' becomes 'hal'.
'only' becomes 'but' (I've seen this before).
'hal'+'i'+'but'='HALIBUT'
'comes to' is the link.
(Other definitions for halibut that I've seen before include "Large edible flatfish" , "Fishy sort" , "Large food fish" , "Large flatfish used as food" , "Marine food fish" .)