Weep quietly -- it's over Charlie's description of this crossword? (7)
I believe the answer is:
cryptic
'description of this crossword?' is the definition.
(this clue is from a cryptic crossword)
'weep quietly it's over charlie's' is the wordplay.
'weep' becomes 'cry' (synonyms).
'quietly' becomes 'p' (p for piano and quiet).
'over' says the letters should be written in reverse.
'charlie' becomes 'C' (phonetic alphabet).
'it' written backwards gives 'ti'.
'cry'+'p'+'ti'+'c'='CRYPTIC'
(Other definitions for cryptic that I've seen before include "this style?" , "Obscure or puzzling (as our neighbour Crossheir)" , "Obscure in meaning" , "'Obscure, puzzling (7)'" , "Like some crosswords" .)