The Lord has inspired king, in embracing a Roman emperor (7)
I believe the answer is:
gordian
'the lord has inspired king in embracing a roman emperor' is the definition.
I can't tell whether this definition defines the answer.
'the lord has inspired king in embracing a' is the wordplay.
'the lord' becomes 'God' (the Lord means God).
'has inspired' is an insertion indicator (inserted letters are breathed in or 'inspired').
'king' becomes 'R' (abbreviation of Latin rex).
'embracing' means one lot of letters goes inside another.
'god' going around 'r' is 'gord'.
'in' enclosing 'a' is 'ian'.
'gord'+'ian'='GORDIAN'
Can you help me to learn more?
(Other definitions for gordian that I've seen before include "'Extremely intricate, as the knot (7)'" , "The - - knot (mythology)" , "sort of knot" , "To cut the - knot is to solve a hard problem" , "involved" .)