23a Go-slow - 1st letters (leads) 'Girls On Strike...'
5d Nestle - (rai)N + anag 'sleet'
11d Mineral water - anag 'new material' + r(evue)
10a T and E,M - (Gua)tem(ala) (central)
15a Eleven - 'el' (Sp. "the") + 'even' (not odd)
16d Vandal - 'V and A' (museum) + (expe)l