Cryptic crossword clue
Stupid fling – man plainly left out the need for this 6,8

The most common and most likely answer to this crossword clue is the 6 plus 8 letter word FAMILY PLANNING

I've seen this crossword clue in Financial Times
F
A
M
I
L
Y
P
L
A
N
N
I
N
G

Buddy explains!

The straight part
We know that "this" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case this = family planning.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

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