Get Ann excited with poet's ultimate touching line (7)
I believe the answer is:
tangent
'touching line' is the definition.
(I've seen this before)
'get ann excited with poet's ultimate' is the wordplay.
'excited with' indicates anagramming the letters.
'ultimate' indicates one should take the final letters.
The final letter of 'poet' is 't'.
'get'+'ann'='getann'
'getann' mixed up with 't' gives 'TANGENT'.
(Other definitions for tangent that I've seen before include "Line touching circumference" , "Straight line that touches but does not intersect a curve" , "Geometric line" , "mostly irrelevant item" , "A new line of thought" .)