Crossword Genius

One anchored at sea sparks up joint (9)

Ross

I believe the answer is:

lightship

'one anchored at sea' is the definition.
(type of ship)

'sparks up joint' is the wordplay.
'sparks up' becomes 'lights'.
'joint' becomes 'hip' (hip joint is a kind of joint).
'lights'+'hip'='LIGHTSHIP'

(Other definitions for lightship that I've seen before include "Moored vessel warning sailors of a hazard" , "The guiding vessel appears not to have much weight" , "Navigational aid" , "vessel anchored near rocks?" , "could reveal a watery problem" .)

I've seen this clue in The Independent.
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