Finally seeing publicity, obtain gizmo (6)
I believe the answer is:
gadget
'gizmo' is the definition.
(I know that gizmo can be written as gadget)
'finally seeing publicity obtain' is the wordplay.
'finally' indicates one should take the final letters.
'publicity' becomes 'ad' (short for advert).
'obtain' becomes 'get' (synonyms).
The last letter of 'seeing' is 'g'.
'g'+'ad'+'get'='GADGET'
(Other definitions for gadget that I've seen before include "Mechanical contrivance" , "Thing made or used for particular purpose" , "appliance" , "Useful small device" , "Clever device" .)