Tetchy bridegroom somewhat cross (6)

I believe the answer is:

hybrid

'cross' is the definition.
(I know that cross can be written as hybrid)

'tetchy bridegroom somewhat' is the wordplay.
'somewhat' says the answer is hidden in the clue.
'HYBRID' is hidden within 'tetchy bridegroom'.

(Other definitions for hybrid that I've seen before include "Cross of two different species or varieties" , "Crossbred" , "Of mixed character" , "Genetic cross" , "Of mixed ancestry" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.