Song of a sailor’s gaff (5)
I believe the answer is:
abode
'song of a sailor's gaff' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'sailor's gaff' is the wordplay.
'sailor' becomes 'ab' (abbreviation for able seaman).
'gaff' becomes 'ode' (I can't justify this - if you can you should believe this answer much more).
'ab'+'ode'='ABODE'
Can you help me to learn more?
(Other definitions for abode that I've seen before include "House, home" , "House made of adobe" , "Home or domicile" , "Place of residence" , "Where one lives" .)