Introductions are commonly shorter without it (7,3)

'introductions' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'are commonly shorter without it' is the wordplay.
I cannot really see how this works, but
an anagram of 'are' is 'era' which is present in the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found in the answer.
This may be the basis of clue (or it may be nonsense).