Crowd united in high spirits for band with no B-side? (6,5)
I believe the answer is:
mobius strip
'band with no b-side?' is the definition.
(one-sided surface)
'crowd united in high spirits' is the wordplay.
I cannot really understand how this works, but
'crowd' could be 'mob' (mob is a kind of crowd) and 'mob' is found within the answer.
'united' could be 'u' (abbreviation) and 'u' is located in the answer.
an anagram of 'spirits' is 'isstrip' which is within the left over letters.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).
'for' acts as a link.
Can you help me to learn more?
(Another definition for mobius strip that I've seen is " Surface with one continuous side, formed by joining the ends of a rectangle after twisting it - I stir up mobs (anag)".)