Night-watchman spends a lot of time looking into space (10)
I believe the answer is:
astronomer
'night-watchman' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?
'spends a lot of time looking into space' is the wordplay.
I cannot quite see how this works, but
'a' is within the answer.
'lot' could be 'm' and 'm' is found in the answer.
'of' could be 'o' and 'o' is located in the answer.
'time' could be 't' and 't' is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for astronomer that I've seen before include "Sky-at-night observer" , "One studying the universe" , "Moon-starer (anag)" , "scientist" , "Moon starer (anag.)" .)