The unclued lights (two of two words), individually or as pairs, are of a kind. Elsewhere, ignore one accent.
 

Across

 
9    Aromatic fragrance from front half of royal residence (4)
11    How embroiderers’ work fell apart — without any trouble (10)
12    The best spinners? (4)
16    Loved one short moment in the air, almost (5)
20    The first way to acknowledge on paper? (7)
21    Talk of a bit of pork crackling (7)
24    Small pastures revealing weaver’s reeds (5)
25    From where to watch the partnership (5)
27    Artlessly return spring water with alkaline solution, mostly (7)
30    Secretary having...