The most common and most likely answer to this crossword clue is the 8 letter word UNDERPIN
I've seen this crossword clue in Financial Times
U
N
D
E
R
P
I
N
More clues leading to the result UNDERPIN
- Junior to dash back to get support
- Support from beneath, needing identification
- Support wicked nun full of false pride
- Support stirring dinner up
- Nip back after funds were stripped to give support
- Corroborate where Nabokov placed comma?
- Where shoe is worn, possibly, gets support
- Support in setting up dinner
- Reporting to fix support
- French and German articles by priest getting popular support
Buddy explains!

The straight part
We know that "support" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case support = underpin.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.
What does UNDERPIN mean?
UNDERPIN verb- To support from below with props or masonry.
- To give support to; to corroborate.