Look hard, endlessly - glower? (4)
I believe the answer is:
star
'look hard' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'endlessly glower?' is the wordplay.
'endlessly' means to remove the last letter.
'glower?' becomes 'stare' (glower is a kind of stare).
'stare' with its final letter taken off is 'STAR'.
Can you help me to learn more?
(Other definitions for star that I've seen before include "E.g.Sirius" , "The leading player is heavenly" , "Symbol of excellence" , "Shiner" , "Outstanding actor" .)