Power of jet fighter leads to high tension (5)
I believe the answer is:
might
'power' is the definition.
('might' can be a synonym of 'power')
'jet fighter leads to high tension' is the wordplay.
'jet fighter' becomes 'mig' (I've seen this in other clues).
'leads' says to put letters next to each other.
'to high tension' becomes 'ht'.
'mig'+'ht'='MIGHT'
'of' is the link.
(Other definitions for might that I've seen before include "Great power/strength" , "Clout" , "What functions as an auxiliary" , "Capability" , "is not unlikely to" .)