I've lost all hope with this now.
21. Mesh protection put back on eye of surfer (6) _E_C__
29. Expired from return of the French pasty (7) - presumably ELAPSED, but I don't get where the 'pasty' comes in
27. Oxygen may be raised in old story (4)
19. Make daring clot mostly retreat (8)
14. Quiet giant held by rare R in station (10) - presumably PROGRESSED - Quiet = P, giant = OGRE, don't see where 'rare R' and 'station' come into it.