Immediately, jerks concealing bias regularly in facts and figures (10)
I believe the answer is:
statistics
'figures' is the definition.
(statistical figures)
'immediately jerks concealing bias regularly' is the wordplay.
'immediately' becomes 'stat' (stat can informally mean at once).
'jerks' becomes 'tics' ().
'concealing' means one lot of letters goes inside another.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternate letters of 'bias' are 'is'.
'stat'+'tics'='stattics'
'stattics' placed around 'is' is 'STATISTICS'.
'in facts and' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for statistics that I've seen before include "Branch of maths" , "(Study of) quantitative data" , "'20, 16 20, and _____'" , "results" .)