Everybody trusts this, oddly (5)
I believe the answer is:
tutti
'everybody' is the definition.
I can't tell whether this definition defines the answer.
'trusts this oddly' is the wordplay.
'oddly' means one should take alternating letters (letters in the odd-numbered positions are used).
'trusts'+'this'='truststhis'
The alternate letters of 'truststhis' are 'TUTTI'.
Can you help me to learn more?
(Other definitions for tutti that I've seen before include "All performers (mus.)" , "Instruction for all orchestral instruments to play together" , "(Of an orchestra) all to play together" , "Orchestral passage" , "All (stage direction)" .)