Fabulous overhead skill? (8)

I believe the answer is:

smashing

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'fabulous' is the definition.
(thesaurus)

'overhead skill?' is the wordplay.
'overhead' becomes 'smash' (synonyms).
'skill?' becomes 'ing' (I can't explain this - if you can you should give a lot more credence to this answer).
'smash'+'ing'='SMASHING'

Can you help me to learn more?

(Other definitions for smashing that I've seen before include "Great" , "Breaking violently into pieces" , "Excellent; breaking" , "2 [COOL] or 3 [DANDY] perhaps, possibly 20d [WICKED] or 22 [GEAR] !" , "Such destructive behaviour" .)

I've seen this clue in The Telegraph.

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