Crossword Genius

What's-his-name is lanky, sticky fellow (12)

Ross

I believe the answer is:

thingummybob

'what's-his-name' is the definition.

'lanky sticky fellow' is the wordplay.
'lanky' becomes 'thin' ('thin' can be similar in meaning to 'lanky').
'sticky' becomes 'gummy' ('gummy' can be a synonym of 'sticky').
'fellow' becomes 'bob'.
'thin'+'gummy'+'bob'='THINGUMMYBOB'

'is' is the link.

(Other definitions for thingummybob that I've seen before include "gizmo" , "Oojamaflip" .)

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