Crossword Genius

One in gym daily beginning to track performance stats? (3,5)

Ross

I believe the answer is:

pie chart

I'm a little stuck... Click here to teach me more about this clue!

'track performance stats?' is the definition.
I can't tell whether this definition defines the answer.

'one in gym daily beginning to' is the wordplay.
'one' becomes 'i' (Roman numeral).
'in' is an insertion indicator.
'gym' becomes 'pe' (Physical Education).
'daily' becomes 'char' (both can mean a cleaner).
'beginning' suggests taking the first letters.
The initial letter of 'to' is 't'.
'i' placed inside 'pe' is 'pie'.
'pie'+'char'+'t'='PIE CHART'

Can you help me to learn more?

(Other definitions for pie chart that I've seen before include "Circle divided by radii to depict percentages of the whole" , "Display of data r" , "Illustration of shares" , "Display of information" , "Graph of a circle divided into sectors" .)

I've seen this clue in The Independent.
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