Crossword Genius

Oddly glum -- so shy, dumpy plain Jane should do this? (5,2)

Ross

I believe the answer is:

gussy up

'plain jane should do this?' is the definition.
(gussy up means to dress up)

'oddly glum so shy dumpy' is the wordplay.
'oddly' indicates alternate letters (letters in the odd-numbered positions are used).
'glum'+'so'+'shy'+'dumpy'='glumsoshydumpy'
The alternate letters of 'glumsoshydumpy' are 'GUSSY UP'.

(Another definition for gussy up that I've seen is " dress in finery".)

I've seen this clue in The Telegraph.
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