Oddly forbid access to ship (7)
I believe the answer is:
frigate
'ship' is the definition.
(frigate is a kind of ship)
'oddly forbid access' is the wordplay.
'oddly' means one should take alternating letters.
'access' becomes 'gate' (I've seen this in other clues).
The alternate letters of 'forbid' are 'fri'.
'fri'+'gate'='FRIGATE'
'to' is the link.
(Other definitions for frigate that I've seen before include "US warship" , "Warship - seabird" , "Light warship" , "Ship" , "Warship; -- bird" .)