Bombs huge town all round: that makes things sticky (9)

I believe the answer is:

viscosity

'that makes things sticky' is the definition.
(the quality of a liquid being sticky or thick)

'bombs huge town all round' is the wordplay.
'bombs' becomes 'vis' (resembles Vcs - Vc was a World War i bomb).
'huge' becomes 'os' (abbreviation for outsize).
'town' becomes 'city' (I've seen this in other clues).
'all round' is an insertion indicator.
'os' going into 'city' is 'cosity'.
'vis'+'cosity'='VISCOSITY'

I've seen this clue in The Guardian.

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