Spice Girl seen in band? This could be sexy (8)
I believe the answer is:
lingerie
'this could be sexy' is the definition.
'spice girl seen in band?' is the wordplay.
'spice girl' becomes 'geri' (Geri Halliwell).
'seen in' means one lot of letters goes inside another.
'band?' becomes 'line'.
'geri' going into 'line' is 'LINGERIE'.
(Other definitions for lingerie that I've seen before include "One from W Atlantic island group" , "Slinky undergarments" , "CLOTHING" , "frillies" , "Women's underwear and nightwear" .)