Crossword Genius

Privates are behind this English flag, if ordered (3,4)

Ross

I believe the answer is:

fig leaf

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'privates' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'behind this english flag if ordered' is the wordplay.
'behind' means one lot of letters go next to another.
'this english' becomes 'e' (abbreviation).
'ordered' is an anagram indicator.
'e'+'flag'='eflag'
'eflag' put next to 'if' is 'eflagif'.
'eflagif' is an anagram of 'FIG-LEAF'.

'are' is the link.

Can you help me to learn more?

(Other definitions for fig leaf that I've seen before include "Adam and Eve attire" , "Eve's modesty garment?" , "Modest cover for nude statues and paintings" , "Growth on fruit tree - first day cover!" , "Greenery worn by Adam or Eve" .)

I've seen this clue in The Guardian.
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