Clear limits to uranium, involving temperature — here’s another metal (8)
I believe the answer is:
platinum
'another metal' is the definition.
'platinum' can be an answer for 'metal' (platinum is a kind of metal). I'm unsure of the 'another' bit.
'clear limits to uranium involving temperature' is the wordplay.
'clear' becomes 'plain' ('plain' can be similar in meaning to 'clear'**).
'limits to' means to remove the middle letters (only the edge letters are used).
'involving' is an insertion indicator.
'temperature' becomes 't' (abbreviation).
'uranium' with its middle removed is 'um'.
'plain'+'um'='plainum'
'plainum' placed around 't' is 'PLATINUM'.
'here's' acts as a link.
(Other definitions for platinum that I've seen before include "Precious metal, Pt" , "Type of blonde; best-selling (record)" , "Atomic number 78" , "1 down, symbol Pt" , "Valuable stuff, after a grind" .)