20 across
Trust
a
sailor
to
provide
a
basis
for
making
advances
to
you!
(6,6)
Trust a sailor to provide a basis for making advances to you! (6,6)
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The whole clue is the definition (& lit or double definition).
How the clue works
The definition is trust, giving you CREDIT. Then a sailor gives you RATING (a rating being an ordinary sailor in the Royal Navy), and stick them together for your chat-up line.