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Cryptic. 4d. React or hesitate a bit, lacking answer, perhaps. (4,2,3,4)
r - s - t - t - - - a - t

18a. Trade fair certain to result in publicity. (8) - - p - s - r -

Easy. 22a. (13) Barrier to free international trade.p - o - e - t - o - i - -

Any help appreciated.

rise to the bait.

18a exposure

Expo sure

4d could be rose to the bait

sorry, of course it's "rise"

protectionism

anag of 'or hesitate a bit' minus an A(lacking answer).

Thank you so much trevor, MaisieP and Wendy.. All finished now.