Being of higher rank, I interrupt the Spaniard (6)
I believe the answer is:
senior
'being of higher rank' is the definition.
'senior' can be an answer for 'being' (senior is a kind of being). I am not certain of the 'of higher rank' bit.
'i interrupt the spaniard' is the wordplay.
'interrupt' is an insertion indicator.
'the spaniard' becomes 'senor' ('mister' in Spanish).
'i' inserted inside 'senor' is 'SENIOR'.
Can you help me to learn more?
(Other definitions for senior that I've seen before include "Superior - elder" , "Higher in status" , "'Older, superior (6)'" , "High-ranking" , "Older in years or higher in rank" .)