More lit up with high tension in Blake's bright burner (7)
I believe the answer is:
tighter
'more lit up' is the definition.
I can't tell whether this definition defines the answer.
'high tension in blake's bright burner' is the wordplay.
'high tension' becomes 'ht'.
'in' is an insertion indicator.
'blake's bright burner' becomes 'tiger' (I've seen this in another clue).
'ht' put inside 'tiger' is 'TIGHTER'.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for tighter that I've seen before include "more closely" , "more mean" , "Less loose" , "Meaner" , "More constricted" .)