Unsupported as energy put into praise (8)
I believe the answer is:
baseless
'unsupported' is the definition.
(similar in meaning)
'as energy put into praise' is the wordplay.
'energy' becomes 'e' (physics symbol as in E=mc2).
'put into' is an insertion indicator.
'praise' becomes 'bless' (I've seen this before).
'as'+'e'='ase'
'ase' inserted inside 'bless' is 'BASELESS'.
(Other definitions for baseless that I've seen before include "lacking support" , "Without grounds" , "Lacking foundation, unsupported" , "Idle" , "Wrong, as a matter of fact" .)