Clearly show trade fair leads to substantially increased transactions (7)

I believe the answer is:

exposit

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'clearly show' is the definition.
'exposit' can be an answer for 'show' (thesaurus). I'm unsure of the 'clearly' bit.

'trade fair leads to substantially increased transactions' is the wordplay.
'trade fair' becomes 'expo' (I've seen this in another clue).
'leads to' indicates taking the first letters.
The initial letters of 'substantially increased transactions' is 'sit'.
'expo'+'sit'='EXPOSIT'

Can you help me to learn more?

I've seen this clue in The Times.

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