Most licentious - so stole without restraint (7)

I believe the answer is:

loosest

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'most licentious' is the definition.
('loose' can be a synonym of 'licentious')

'so stole without restraint' is the wordplay.
'so stole' anagrams to 'LOOSEST'.
However, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for loosest that I've seen before include "most relaxed" , "most unstable" .)

I've seen this clue in The Irish Independent.

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