The unclued Across lights are of a kind, as are the unclued Down ones, all verifiable in Chambers.
 

Across

7    Awkward tiff before mid-July is spasmodic (6)
11    Passionate entreaty from injured courier, around last month (10, three words)
13    Older noble initially gallant during those times (5)
14    Stock Exchange certificate St Paul found regularly (5)
15    Be determined by timeless article a very long time (7, two words)
17    Bringing ashore fish and it’s boxed! (7)
18    Indian comprehending most of old language (6)
19    Male Europeans consume unknown Mediterranean dishes (4)
22    Missed end of planned deadline – a note omitted (6)
24    Working in the parlour, she...