Right towards the back of a floating platform (4)
I believe the answer is:
raft
'a floating platform' is the definition.
(I've seen this before)
'right towards the back' is the wordplay.
'right' becomes 'r' (common abbreviation).
'towards' means one lot of letters go next to another (I've seen this in other clues).
'the back' becomes 'aft' (at the back of a ship).
'r'+'aft'='RAFT'
'of' is the link.
(Other definitions for raft that I've seen before include "Structure that floats" , "water transport" , "... Lots" , "Floating log structure; large amount" , "Floating platform of logs, planks, etc" .)