What surveyors use out training shuffling around Los Angeles (13)
I believe the answer is:
triangulation
'what surveyors use' is the definition.
I can't judge whether this defines the answer.
'out training shuffling around los angeles' is the wordplay.
'shuffling' indicates anagramming the letters.
'around' indicates putting letters inside.
'los angeles' becomes 'LA' (abbreviation).
'out'+'training'='outtraining'
'outtraining' anagrammed gives 'triangution'.
'triangution' placed around 'la' is 'TRIANGULATION'.
Can you help me to learn more?
(Other definitions for triangulation that I've seen before include "Technique of surveying" , "Training a lout (anag) - map-making procedure" , "Surveying using trig" .)