It floats right behind (4)

I believe the answer is:

raft

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'it floats' is the definition.
The definition suggests a singular noun which matches the answer.

'right behind' is the wordplay.
'right' becomes 'r' (common abbreviation).
'behind' becomes 'aft' (aft means towards or at the end of a ship).
'r'+'aft'='RAFT'

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(Other definitions for raft that I've seen before include "Simple floating structure" , "Buoyant platform" , "Flat floating craft" , "Floating framework" , "Wooden craft" .)

I've seen this clue in the Evening Standard.

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