Unfriendly crowd that is gathering close to memorial (7)
I believe the answer is:
hostile
'unfriendly' is the definition.
(associated in meaning)
'crowd that is gathering close to memorial' is the wordplay.
'crowd' becomes 'host' (I've seen this before).
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'gathering' means one lot of letters goes inside another.
'close to' says to take the final letters (the close/ending of).
The final letter of 'memorial' is 'l'.
'ie' going around 'l' is 'ile'.
'host'+'ile'='HOSTILE'
(Other definitions for hostile that I've seen before include "The soil strangely is unfriendly" , "Showing angry opposition" , "Inimical" , "Aggressive" , "Antagonistic" .)