Regularly overlooked groomsmen, so making spectacular bloomers (5)
I believe the answer is:
roses
'spectacular bloomers' is the definition.
'roses' can be an answer for 'bloomers' (I've seen this before). I'm not sure about the 'spectacular' bit.
'regularly overlooked groomsmen so' is the wordplay.
'regularly overlooked' indicates alternate letters (letters removed at regular intervals).
'groomsmen'+'so'='groomsmenso'
The alternating letters of 'groomsmenso' are 'ROSES'.
'making' acts as a link.
Can you help me to learn more?
(Other definitions for roses that I've seen before include "favours > certain wines" , "Occupants of bed" , "Ramblers, for example" , "''. . . . . are red, violets are blue''" , "Flowers, usually red, pink, white or yellow" .)