Saying “bottoms up” endlessly (5)
I believe the answer is:
motto
'saying' is the definition.
(I know that motto is a type of saying)
'bottoms up endlessly' is the wordplay.
'MOTTO' is hidden backwards within the letters.
However, I am uncertain how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for motto that I've seen before include "Christmas cracker text" , "(Family) maxim" , "Words often found on coat of arms" , "Favourite saying of a group" , "Guiding adage" .)