One keeping an eye on the time? (7)
I believe the answer is:
watcher
'one keeping an eye on the time?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'one keeping an eye on' is the wordplay.
'one keeping an' becomes 'er' (I am not sure about this - if you are sure you should believe this answer much more).
'eye' becomes 'watch' (I've seen this in another clue).
'on' says to put letters next to each other.
'er' put after 'watch' is 'WATCHER'.
Can you help me to learn more?
(Other definitions for watcher that I've seen before include "One who observes" , "Big Brother?" , "I observe" , "Onlooker" , "Alert observer" .)