Heard first person on ship get a cosmetic (8)
I believe the answer is:
eyeliner
'a cosmetic' is the definition.
(I've seen this before)
'heard first person on ship' is the wordplay.
'heard' indicates a 'sounds like' (homophone) clue.
'first person' becomes 'I' (first-person pronoun).
'on' says to put letters next to each other.
'ship' becomes 'liner' (as in an ocean liner).
'i' sounds like 'eye'.
'eye'+'liner'='EYELINER'
'get' acts as a link.
(Other definitions for eyeliner that I've seen before include "Type of make-up" , "it draws attention to the viewer" , "Makeup for the peepers" , "Dark marks left by this" , "Facial cosmetic" .)