Inheritor fellow on ship hides anger (7)
I believe the answer is:
heiress
'inheritor' is the definition.
(I know that heiress is a type of inheritor)
'fellow on ship hides anger' is the wordplay.
'fellow' becomes 'he' ('he' refers to a man).
'on' says to put letters next to each other.
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'hides' indicates putting letters inside.
'anger' becomes 'ire' (ire is intense rage).
'he'+'ss'='hess'
'hess' going around 'ire' is 'HEIRESS'.
(Other definitions for heiress that I've seen before include "He rises (anag.)" , "she'll succeed" , "Portia, say" , "Woman with good prospects" , "Female expecting to succeed" .)