Impressive display (5)
'impressive display' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for array that I've seen before include "Matrix; arrange" , "Matrix; finery" , "Impressive display or range of something" , "Imposing arrangement" , "Order - arrangement" .)
(Other definitions for spectacle that I've seen before include "sensational event" , "presentation" , "of which a pair should improve 25 [SIGHT]" , "one of a pair for viewers?" , "what may be regarded as > ridiculous" .)