Glimmer from learner in poor game (5)
I believe the answer is:
gleam
'glimmer' is the definition.
(synonyms)
'learner in poor game' is the wordplay.
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'in' means one lot of letters goes inside another.
'poor' is an anagram indicator.
'game' anagrammed gives 'geam'.
'l' placed into 'geam' is 'GLEAM'.
'from' is the link.
(Other definitions for gleam that I've seen before include "Ray" , "Coruscate" , "Flash of light" , "Sparkle, glimmer" , "Shimmer" .)