Strange about ambassador, in trouble, getting metal (7)
I believe the answer is:
rhenium
'metal' is the definition.
(I know that rhenium is a type of metal)
'strange about ambassador in trouble' is the wordplay.
'strange' becomes 'rum' (similar in meaning).
'about' means one lot of letters goes inside another.
'ambassador' becomes 'HE' (His or Her Excellency).
'trouble' is an anagram indicator.
'in' anagrammed gives 'ni'.
'he'+'ni'='heni'
'rum' going around 'heni' is 'RHENIUM'.
'getting' is the link.
(Other definitions for rhenium that I've seen before include "Chemical" , "Metal" , "Element (Re)" .)