Iron Maiden’s new parts to jam in time? (4-11)

'in time?' is the definition.
(time is the fourth dimension)

'iron maiden's new parts to jam' is the wordplay.
'new' indicates an anagram.
'parts' indicates putting letters inside (in the sense of cuts or separates).
'to jam' becomes 'foul' (fouling is a kind of jamming).
'iron'+'maidens'='ironmaidens'
'ironmaidens' with letters rearranged gives 'rdimensiona'.
'rdimensiona' inserted within 'foul' is 'FOUR-DIMENSIONAL'.