Old-fashioned crucifix lifted in the open air (7)
I believe the answer is:
outdoor
'in the open air' is the definition.
(I've seen this before)
'old-fashioned crucifix lifted' is the wordplay.
'old-fashioned' becomes 'out' (as opposed to 'in').
'crucifix' becomes 'rood' ('rood' can be a synonym of 'crucifix').
'lifted' is a reversal indicator (going up in down clue).
'rood' written backwards gives 'door'.
'out'+'door'='OUTDOOR'
(Other definitions for outdoor that I've seen before include "External" , "Not inside" , "healthy pursuits" , "in the garden, say" , "not under cover" .)