Fishing gear around trailer seat affected position of stability (9)
I believe the answer is:
roadstead
'position of stability' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'fishing gear around trailer seat affected' is the wordplay.
'fishing gear' becomes 'rod' (I've seen this in another clue).
'around' indicates putting letters inside.
'trailer' becomes 'ad' (short for advert).
'affected' indicates anagramming the letters.
'seat' anagrammed gives 'stea'.
'ad'+'stea'='adstea'
'rod' placed around 'adstea' is 'ROADSTEAD'.
Can you help me to learn more?
(Other definitions for roadstead that I've seen before include "Sheltered spot where ships may ride at anchor" , "Sheltered stretch of water for anchoring ships" , "anchorage" .)