Not moving fish nets close to quay (5)
I believe the answer is:
lying
'not moving' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'fish nets close to quay' is the wordplay.
'fish' becomes 'ling' (ling is a kind of fish).
'nets' indicates putting letters inside (some letters are contained or netted).
'close to' indicates one should take the final letters (the close of something is the end).
The last letter of 'quay' is 'y'.
'ling' placed around 'y' is 'LYING'.
Can you help me to learn more?
(Other definitions for lying that I've seen before include "Prone or supine" , "Deceit" , "possibly, to be mendacious" , "Prone - mendacity" , "Prone - untruthful" .)