Docking terminal moved within canal (11)
I believe the answer is:
curtailment
'docking' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'terminal moved within canal' is the wordplay.
'moved' indicates anagramming the letters.
'within' means one lot of letters goes inside another.
'canal' becomes 'cut' (cut is a kind of canal).
'terminal' anagrammed gives 'rtailmen'.
'rtailmen' put within 'cut' is 'CURTAILMENT'.
Can you help me to learn more?
(Other definitions for curtailment that I've seen before include "Bringing to an end" , "Contraction" , "premature end" , "Terminal cut (anag) - downsizing" , "Abridgement, shortening" .)