Big name expressing a temper is increasingly unusual (8)
I believe the answer is:
stranger
'increasingly unusual' is the definition.
I can't judge whether this defines the answer.
'big name expressing a temper' is the wordplay.
'big name' becomes 'star' (I've seen this before).
'expressing' indicates named letters should be taken away.
'temper' becomes 'anger'.
'star' with 'a' removed is 'str'.
'str'+'anger'='STRANGER'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for stranger that I've seen before include "Less familiar" , "'Fact is ........ than fiction'" , "someone making nuisance call?" , "Truth can be ... than fiction" , "More exotic" .)