st4494

[perdell]

6dmongrel let in to accept piece of crust (8.5)t?c?o???p?a?e
15a holiday tha is extemely short taken by footballers (6)???s?a
16d shot adequate for approach )4.2.2) ?e?d?p?o

[kayakamina]

tectonic plate

fiesta

lead up to

[johnalex]

16d Lead up to

[Frank97]

6d Tectonic plate

[bookbinder]

6d tectonic plate
15 siesta?

[dannyk13]

15a. Fiesta

[Lie-in King]

6d Tectonic plate (piece of [Earth's] crust) - anag (mongrel) 'let in to accept'
15a Fiesta - 'ie + s(hor)t' (that is + extreme letters of 'short', in) 'FA' (footballers)
16d Lead up to - 'lead' as shot - weight, ammo...

[perdell]

thanks to you all for helping me finish the puzzle today