Sunday Express Skeleton 6Th October

[Frustrate]

Sorry, still stuck on last three. 13a Blast radius not all that, say 4 letters r?t?

17a Rock singer's original style 4 letters s?a?

16a Restaurant bringing great tripe flan back. Think it is 5 letters ?t?o?

Please help! Frustrate 

[Buenchico]

17a s way

[Buenchico]

16a seen as 'trattoria' but that's nowhere near to 5 letters and I can't parse it anyway!

[Buenchico]

13a seen as 'rats'.  (From blAST Radius???)

[TheWinner]

also seen it as trattorria.
flan =tart (backwards) = trat

torria means victor/conqueror (great)

[scorpiojo]

A1 (great) rot (tripe) tart (flan) reversed 

[TheWinner]

soz, only one r in trattoria.

[JJ109]

toria = A1 (great) rot (tripe) reversed

[scorpiojo]

Trattoria ^^

[JJ109]

I may be wrong but I think

rats = blast

R = radius

+ not all th "AT S" ay

[Frustrate]

Many thanks all of you, especially the answer to 16a. I had the grid wrong (again!) I couldn't work it out so grateful that I can finish it now. Frustrate