This definition appears very rarely
See other meanings of CLUT
Samples in periodicals archive:
2055 (e) (2) (B) and 2522 (c)(2)(B), an estate and gift tax charitable deduction is allowed for a CLT if the interest passing to charitable and noncharitable beneficiaries is in the form of a charitable lead annuity trust (CLAT) or a charitable lead unitrust (CLUT).
To be qualified, a charitable lead interest must be in the form of (1) a guaranteed annuity (a charitable lead annuity trust (CLAT)) or (2) a unitrust (a charitable lead unitrust (CLUT)).