Salamander all too unsettled around centre of Texas (7)
I believe the answer is:
axolotl
'salamander' is the definition.
(axolotl is a kind of salamander)
'all too unsettled around centre of texas' is the wordplay.
'unsettled' is an anagram indicator.
'around' indicates putting letters inside.
'centre of' means to look at the middle letters.
The middle of 'texas' is 'x'.
'all'+'too'='alltoo'
'alltoo' anagrammed gives 'aolotl'.
'aolotl' going around 'x' is 'AXOLOTL'.
(Other definitions for axolotl that I've seen before include "Aquatic salamander of N America" , "Mexican native" , "Type of salamander" , "amphibian" , "Central American salamander - lax tool (anag)" .)