Charlie has put away a black jumper (7)

I believe the answer is:

wallaby

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'a black jumper' is the definition.
'wallaby' can be an answer for 'jumper' (I've seen this before). I am not sure about the 'a black' bit.

'charlie has put away' is the wordplay.
'charlie has' becomes 'walla' (I can't justify this - if you can you should believe this answer much more).
'put' says to put letters next to each other.
'away' becomes 'by' (synonyms).
'walla'+'by'='WALLABY'

Can you help me to learn more?

(Other definitions for wallaby that I've seen before include "Australian marsupial" , "Jumping marsupial" , "Small marsupial" , "Native antipodean marsupial" , "Kangaroo-like creature" .)

I've seen this clue in The Times.

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