Suggestion Emma endlessly upset girl running around (7)
I believe the answer is:
glimmer
'suggestion' is the definition.
(I know that glimmer is a type of suggestion)
'emma endlessly upset girl running around' is the wordplay.
'endlessly' means to remove the last letter.
'upset' says the letters should be written backwards.
'running' indicates an anagram (the letters run around to different places).
'around' is an insertion indicator.
'emma' with its last letter taken off is 'emm'.
'emm' in reverse letter order is 'mme'.
'girl' anagrammed gives 'glir'.
'mme' placed inside 'glir' is 'GLIMMER'.
(Other definitions for glimmer that I've seen before include "Intimation (of hope?)" , "Faint glow" , "Faint wavering light" , "Shine faintly with a wavering light" , "Flicker" .)