Glaring wildly after finding space is expanding (9)
I believe the answer is:
enlarging
'is expanding' is the definition.
(thesaurus)
'glaring wildly after finding space' is the wordplay.
'wildly' indicates anagramming the letters.
'after' is a charade indicator (letters next to each other).
'finding space' becomes 'en' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'glaring' is an anagram of 'larging'.
'larging' put after 'en' is 'ENLARGING'.
Can you help me to learn more?
(Other definitions for enlarging that I've seen before include "speaking at length" , "Making bigger" .)